Neovim on Cesar Gimenes

Customizing Neovim: Sorting and Removing Duplicate Lines with Lua

crg@crg.eti.br (Cesar Gimenes) — Fri, 29 Nov 2024 00:31:30 -0300

Continuing my Neovim customizations, here are two functions I use frequently: sort_lines and sort_and_uniq_lines. As the names suggest, they sort the content of the selected lines and, in the case of sort_and_uniq_lines, also remove duplicates.

function sort_lines()
 -- Get the start and end position of the selection
 local start_pos = vim.fn.getpos("'<")
 local end_pos = vim.fn.getpos("'>")

 -- Convert the position to the line index

 -- Adjust start_pos because lines in Lua start at 0
 local start_line = start_pos[2] - 1
 -- No need to adjust end_line
 local end_line = end_pos[2]

 -- Get the selected lines
 local lines = vim.api.nvim_buf_get_lines(
 0,
 start_line,
 end_line,
 false
 )

 -- Sort the lines
 table.sort(lines)

 -- Replace the original lines
 vim.api.nvim_buf_set_lines(
 0,
 start_line,
 end_line,
 false,
 lines
 )
end

function sort_and_uniq_lines()
 local start_pos = vim.fn.getpos("'<")
 local end_pos = vim.fn.getpos("'>")

 local start_line = start_pos[2] - 1
 local end_line = end_pos[2]

 local lines = vim.api.nvim_buf_get_lines(
 0,
 start_line,
 end_line,
 false
 )

 table.sort(lines)

 -- Remove duplicate lines
 local uniq_lines = {}
 local last_line = nil
 for _, line in ipairs(lines) do
 if line ~= last_line then
 table.insert(uniq_lines, line)
 last_line = line
 end
 end

 vim.api.nvim_buf_set_lines(
 0,
 start_line,
 end_line,
 false,
 uniq_lines
 )
end

vim.api.nvim_set_keymap(
 'v',
 '<Leader>s',
 ':lua sort_lines()<CR>',
 { noremap = true, silent = true }
)
vim.api.nvim_set_keymap(
 'v',
 '<Leader>u',
 ':lua sort_and_uniq_lines()<CR>',
 { noremap = true, silent = true }
)

sort_lines.lua

Building a Bookmark System in Neovim with Lua

crg@crg.eti.br (Cesar Gimenes) — Mon, 25 Nov 2024 00:25:27 -0300

Continuing our series of articles aimed at reducing the cognitive effort involved in programming tasks, here is my small bookmark script for Neovim.

Neovim is incredibly customizable. Without having to build full plugins, you can add a lot of functionality with just a few Lua functions.

In my day-to-day work, I often need to return to the same files to fix and test problems. Opening those files directly at the right line, without wasting time navigating, is essential.

Reducing Cognitive Complexity in Programming

crg@crg.eti.br (Cesar Gimenes) — Sat, 23 Nov 2024 21:28:27 -0300

I spend a lot of time and effort reducing cognitive complexity when I program.

Cognitive complexity is how much you have to think to get a task done. Small details can make a task unnecessarily complex.

For example, finding a snippet of code hidden among many files inside a large directory structure takes effort. Even if the structure is familiar and well designed, the goal is not to navigate through it opening files until you find the code to edit; the goal is simply to edit the code. Anything beyond that is wasted cognitive effort.